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Testing isotropy of cosmos with WMAP and PLANCK data
Rath, Pranati K.; Samal, Pramoda Kumar
In recent years, there have been a large number of studies which support violation of statistical isotropy. Meanwhile, there are some studies which also found inconsistency. We use the power tensor method defined earlier in the literature to study the new CMBR data. The orientation of these three orthogonal vectors, as well as the power associated…
Spectro-Imaging of the Asymmetric Inner Molecular and Dust Shell Region of the Mira Variable W Hya with MIDI/VLTI
Quirrenbach, A.; Lopez, B.; Kerschbaum, F. +4 more
Not Available
Based on observations made with the Very Large Telescope Interferometer (VLTI) at the Paranal Observatory under program IDs 083.D-0294, 084.D-0334, and 085.D-0201.On X-ray pulsations in β Cephei-type variables
Hamann, W. -R.; Hubrig, S.; Oskinova, L. M. +4 more
Context. β Cep-type variables are early B-type stars that are characterized by oscillations observable in their optical light curves. At least one β Cep-variable also shows periodic variability in X-rays.
Aims: Here we study the X-ray light curves in a sample of β Cep-variables to investigate how common X-ray pulsations are for this type of s…
First Detection of HCO+ Absorption in the Magellanic System
Murray, Claire E.; Stanimirović, Snežana; Wong, Tony +9 more
We present the first detection of HCO+ absorption in the Magellanic System. Using the ATCA, we observed nine extragalactic radio continuum sources behind the Magellanic System and detected HCO+ absorption toward one source located behind the leading edge of the Magellanic Bridge. The detection is located at an LSR velocity of…
Origin of the Diffuse, Far Ultraviolet Emission in the Interarm Regions of M101
Calzetti, Daniela; Leitherer, Claus; Chandar, Rupali +4 more
We present images from the Solar Blind Channel on the Hubble Space Telescope that resolve hundreds of far-ultraviolet (FUV) emitting stars in two ∼1 kpc2 interarm regions of the grand-design spiral M101. The luminosity functions of these stars are compared with predicted distributions from simple star formation histories, and are best r…
Chemical abundances in the PN Wray16-423 in the Sagittarius dwarf spheroidal galaxy: constraining the dust composition
Otsuka, Masaaki
We performed a detailed analysis of elemental abundances, dust features, and polycyclic aromatic hydrocarbons (PAHs) in the C-rich planetary nebula (PN) Wray16-423 in the Sagittarius dwarf spheroidal galaxy, based on a unique data set taken from the Subaru/HDS, MPG/ESO FEROS, HST/WFPC2, and Spitzer/IRS. We performed the first measurements of Kr, F…
HerMES: disentangling active galactic nuclei and star formation in the radio source population
Hatziminaoglou, E.; Bock, J.; Cooray, A. +12 more
We separate the extragalactic radio source population above ∼50 µJy into active galactic nuclei (AGN) and star-forming sources. The primary method of our approach is to fit the infrared spectral energy distributions (SEDs), constructed using Spitzer/IRAC (Infrared Array Camera) and Multiband Imaging Photometer for Spitzer (MIPS) and Herschel…
Investigation of the Chirikov resonance overlap criteria for equatorial magnetosonic waves
Walker, S. N.; Canu, P.; Balikhin, M. A. +2 more
Observations of equatorial magnetosonic waves made during the Cluster Inner Magnetospheric Campaign clearly show discrete spectra consisting of emissions around harmonics of the proton gyrofrequency. Equatorial magnetosonic waves are important because of their ability to efficiently scatter electrons in energy and pitch angle. This wave-particle i…
Observations of water with Herschel/HIFI toward the high-mass protostar AFGL 2591
van Dishoeck, E. F.; van der Tak, F. F. S.; Wyrowski, F. +2 more
Context. Water is an important chemical species in the process of star formation, and a sensitive tracer of physical conditions in star-forming regions because of its rich line spectrum and large abundance variations between hot and cold regions.
Aims: We use spectrally resolved observations of rotational lines of H2O and its isoto…
VLT FORS2 optical imaging and spectroscopy of nine luminous type 2 AGN at 0.3 < z < 0.6 - I. Ionized gas nebulae
Humphrey, A.; Villar-Martín, M.; Arribas, S. +4 more
We present optical imaging and long slit spectroscopic observations of nine luminous type 2 active galactic nuclei (AGN) within the redshift range 0.3 < z < 0.6 based on Very Large Telescope Focal Reducer and Low Dispersion Spectrograph (VLT FORS2) data. Most objects (6/9) are high luminosity Seyfert 2, and three are type 2 quasars (QSO2), w…